Portable air purifier



FIG. 1 is a perspective view of a portable air purifier showing our new design;

FIG. 2 is an enlarged top plan view thereof;

FIG. 3 is a front elevational view thereof;

FIG. 4 is a right side elevational view thereof;

FIG. 5 is a left side elevational view thereof; and,

FIG. 6 is a rear elevational view thereof.

The bottom surface of the portable air purifier is not part of the design sought to be patented and is therefore not shown. The seams are not part of the design sought to be patented and are therefore shown in dashed lines. 

The ornamental design for a portable air purifier, as shown and described. 